Old Zhang's AI Learning

Jul 6, 2026 · Artificial Intelligence

Why Codex’s GPT‑5.5 Suddenly Returns Short Answers: The Hidden 516 Token Bug

An analysis of a community‑reported issue shows that Codex’s GPT‑5.5 model frequently stops at a fixed token count of 516 (and multiples thereof), causing premature answers on complex tasks, and the article explores the data, possible causes, and mitigation strategies.